[kodekloud] 02 Scheduling : Taints and Tolerations 풀이

Q1. How many nodes exist on the system?

alias k=kubectl; k get nodes

Q2.Do any taints exist on node01 node?

kubectl describe node node01 | grep -i taints
# i 옵션 : 특정 문자열을 대소문자 구분 없이 검색

Q3. Create a taint on node01 with key of spray, value of mortein and effect of NoSchedule

 k taint node node01 spray=mortein:NoSchedule
 #kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N [options]

이전에는 none이 었던 taint가 변경된것을 확인할 수 있다. 

Q4. Create a new pod with the nginx image and pod name as mosquito.

k run mosquito --image=nginx

명령형 접근법

선언형 접근법

Q5. What is the state of the POD?

Q6. Why do you think the pod is in a pending state?

k describe pods

POD Mosquito cannot tolerate taint Mortein

Q7. Create another pod named bee with the nginx image, which has a toleration set to the taint mortein.

k run bee --image=nginx --dry-run=client -o yaml > bee.yaml #파일 생성
k create -f bee.yaml

--
 tolerations:
  - key: spray
    value: mortein
    effect: NoSchedule
    operator: Equal

 

Q8. Notice the bee pod was scheduled on node node01 despite the taint.

 

Q9. Do you see any taints on controlplane node?

k describe  node controlplane

Q10. Remove the taint on controlplane, which currently has the taint effect of NoSchedule.

kubectl taint nodes controlplane node-role.kubernetes.io/control-plane:NoSchedule-

Q11. What is the state of the pod mosquito on now?

running

Q12. Which node is the POD mosquito on now?

controlplane